Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Integrate Shaker as a new testcase

    Shaker wraps around popular system network testing tools like iperf,
    iperf3 and netperf (with help of flent).

    Change-Id: Idd82ffd9642c90335ad156e899c0330473260f15
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 0f6c31a..eb864cc 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 0f6c31a434873068e6c3bfecf31930536bf59d2f
+Subproject commit eb864cc183005479e4fd00d3b849034fcab5bffc